I lasercut and assembled myself one of these babies in a few hours today.
It's great, and very good at what it does.

However, even with some padding it made my machine louder by a significant amount.
This is cool when I am playing flight of the bumblebee, but not when I am printing late at night.
Not sure how to fix that other than better feet and more insulation or something.

Haven't had much luck with mine yet as it keeps jamming. Whenever the bot pulls the filament the spindle gains momentum and keeps spinning which unreels more filament which gets pulled under the spool and jams. I think that the spindle spins too freely, there needs to be some friction to prevent it gaining momentum. I totally expect this issue to go away once the spool gets smaller but there may be something we can print to resolve this issue, maybe a ramp that stops filament from going under the spool or something to add friction to the spool.

I've had a problem with the spindle jamming and have found a solutions that works for now…

I simply clip the ties near the top side of the ABS bundle, but don't remove them… this way I have a very soft strip holding the filament in place and away from the bottom plate of the spindle, yet it allows the filament to slip out as needed.

"Gathering all the parts for building one of these can be pretty time-consuming. Some of the parts like the lasercut parts and solenoid valves are difficult to source. Not only that, but buying a kit from the creators supports us so we can make it better. That's why we offer a kit that contains everything you need to build one yourself."

Solenoids? Eh? Of all things in the Makerbot Store, this looks like the number one thing to build instead of buy. Especially at 60 bucks…